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1

Hello Dear Dr. Plimpton

Is it possible to apply dynamic stress boundary condition in PDLAMMPS?

I use the fix addforce command to apply this boundary condition. But it requires large forces to move the atoms.(for example my problem needs 3N forces but I must apply 3*10^6N !!!).

The reason might be the way that I apply the boundary condition. Would you tell me the procedures of applying dynamic stress boundary condition?

I run PDLAMMPS on windows.

Thank you in advance.

Best regards.

2

First, I’m not sure what you mean by PDLAMMPS. Do you mean
you run LAMMPS with its PeriDynamics options?

Fix addforce adds the specified force to each atom, in the units
you are using. If you are using cg or si units, as sometimes
users do for PD, then maybe that is the issue. Otherwise, I know
of no problems with the addforce command.

I don’t know what you mean by dynamic stress BC. You’ll have
to explain in more detail.

Steve